Piston expanding machine



July 3, 1945. A. J. DAVIS PISTON EXPANDING MACHINE 2 Sheets-Sheet 1 Filed July 18, 1944 July 3, 1945. A. J. DAVIS PISTON EXPANDING MACHINE Filed July 18, 1944 2 Sheets-Sheet 2 woe/whom I 3 Illllllllll.

Patented July 3, 1945 STATES PATENT OFFICE Y H i 2,379,627

IIPISTONEXPANDHFGIMACHINE- Alto .LDavis, Montgomery, Ala. Application July 18, 1944, Serial-'No. 545,510 4 Claims. r01. ass-+4) The present invention relates to the art. of reconditioning pistons, and has for its primary object to provide, in a manner as hereinafter set forth, an apparatus comprising a novel combination and arrangement whereby worn or collapsed pistons may be expeditiously expanded to the desired size for further use. H

. Another very important object of the invention is to provide a piston expanding apparatus of the aforementioned character embodying a novel construction and arrangement of gauge whereby the piston may be accurately expanded to the desired size. I

Still another very important object of the invention is to provide an apparatus of the character' described inwhich the piston'may be expanded in the desired direction to compensate for uneven wear on the piston or for an out-'of-round cylinder'in which the piston operates;

Other objects of the invention. are to provide a piston expanding machine of the character set forth which will be comparatively simple in con- 4 on the forward end of the tubular shaft 2 is a ring 5. i 7

- Threadedly mountedin diametrically opposite sides of the ring are screws 6 and 1. Opposed jaws 8- are'swivelly mounted on the'inner ends of the screws 6 and 1 for receiving' and clamping therebetween the piston to be expanded, as at 3.

A lock'nut l0 secures the screw 6 in adjusted posistruction, strong, durable, highly eiiicient and reliable in use, compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become ap-- parent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the severalviews, and wherein:

Figure 1 is a top plan view of a piston handling tool constructed in accordance with the present.

invention, showing a piston mounted therein.

Figure 2 is a view in side elevation thereof.

tion. A turning rod is mounted in the head on the outer end of the screw 1. It will be observed that the piston 9 is mounted in the device in an inverted position and that the jaws 8 are engaged with said piston over the wrist pin openings l2 therein.

Guides [3 are mounted at spaced points on the tubular shaft 2. Slidable in the guides 13 is a rod ll which is engageableat one end with the skirt of the piston 9. A sleeve i5 is mounted for longitudinal slidingadjustment on the rear end portion of the tubular shaft 2. Mounted on the adjustable sleeve I5 is a gauge It which is engageable with the rod It for actuation thereby.

Referring now to Figures 4, 5 and 6 of the drawings, it will be seen that reference character 11 designates generally an oven for heating the piston Figure 3 is a view in transverse section, taken substantially on the line 33 of Figure 1.

Figure 4 is a view in front elevation of the heating oven.

Figure 5 is a vertical sectional view through the oven.

Figure 6 is a view in horizontal section through the oven.

Figure '7 is an elevational view of the cooling container with a portion thereof broken away in section.

Referring now to the drawings in detail, it will I be seen that the embodiment of the invention which has been illustrated comprises a tool which is designated generally by reference character I. The tool I includes a tubular metallic shaft 2 of suitable length and diameter having fixed on its rear end a handle 3. Removably secured by screws to be expanded. The oven ll includes a substantially cylindrical vertical drum l8 which is supported in elevated position by legs I 9. Rising from the top 20 of the drum I8 is a flue 2 I.

The bottom 22 of the drum l8 has formed therein a circular opening 23. Removably mounted beneath the bottom 22 for heating the drum l8 through the opening 23 is a gas burner 24. If desired, an electric hot plate may be substituted for the gas burner 24. Threaded rods 25 are mounted vertically in the drum l8. Mounted for vertical adjustment on the rodsl25 is an annular rest 26. Pairs of nuts 21 on-the rods 25 secure the rest 26 in adjusted position.

Access to the rest 26 is'had through a door 28 which is rigidly mounted at 29 on the front of the drum l8. A knob or handle 30 is provided on the free end of the door 28. Mounted on the top 20 of the drum l8, in front of the flue2l, is an instruction chart 3|.

In Figure 7 of the drawings there is shown a receptacle 32. The receptacle 32 is filled to the desired level with water, as at 33, for cooling the pistons when they are immersed therein,

It is thought that the operation of the machineand secured between the jaws 8. The desired pressure is applied to the piston and the rod I4 is engaged with the skirt thereof. The sleeve I5 .is then adjusted forwardly on the tubular shaft sion, as indicated by the gauge l6, has taken" place. The temperature that various heights and sizes of pistons should be subjected to,.the length of time, et cetera, may be readily ascertained by' consulting the chart 3|. When the piston has been expanded to the correct size, it is removed from the oven IT, and, still in the tool I, is cooled by immersion in th -rate 3 ,1 We r cep ac e 32. Theoperation has now been completed, By c ampin the p ston in th ring ,flwith, the wrist pin eyes e ween he jaws}, xpansion o t pistQn in this direction will .beprevented and expansion in a, direction at right angle will 00; Qur, the e y he a h eeandit piston o compensate for the usual, uneven, wear that ha oQQhr ed-Qh the skirt thereoiand to conform toan. e t-. z mii d. cylinder in, imeh t mayhe l-m d f i r hana Itis belie ed that the many advantages of a pie expandi g machine construc ed in accord? ance with the present invention will be, readily unders od, and. although ,a pr ierred embod meht of theappaitatus. isasjillustrated and desc ibed t s h understood that changes in the d tails of construction and, in the combination andv arrangementoiparts may-be esorted to which will fall, within the. scope of the inven. ion as claimed. l

What is, claimed is: l

A piston e panding apparatus, comprisin shaft, a ring in combination, an oven, heating means in the oven, an annular rest in the oven above said heat ing means, a ring removably mounted on the rest, and means for securing a piston in said ring over the heating means.

2. A piston expanding apparatus comprising, in combination, a piston handling tool, and an oven for the reception of the tool, said oven including a drum, heating meansin the lower portion oi the. d um; a plurality of vertic s in the drum, an annular rest mounted for vertical adjustment on said rods, the tool including a on one end of said shaft adapted to be removably mounted on the annular rest,.and means for securing a piston in the ring in spaced relation thereto for supporting said piston over the heating means.

3. A piston expanding machine comprising a shaft, a handle on one end of the shaft, a ring on the other end of said shaft, means for clamping a piston in the ring in spaced relation thereto, a rodslidahly mounted on the shaft and engage able, atone end, with the piston for actuation thereby, and a gauge mounted on -the shaftand engageable with the other end of the rod for actuation thereby,

4. A piston expanding machine comprising a tubular shaft, a handle fixed on one end of'said shaft, a removable ring mounted on the other end of the shaft, aligned screws threadedly mounted in diametrically opposite sides of the ring, coaoting jaws on the inner ends of said screws engageable with the piston for securing said piston in the ring in spaced relation thereto, guides mounted at spaced point on the shaft, 2, rod slidable in the g ides and engageable at one end with they piston for ac uation thereby, a sleeve, mounted; for loneitudinal sliding, djustment on the shaft, and a gauge mounted on said Sleeve and engaaeable with 0 c the other end of the rod for actuation therein? 

